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2019 Crushed Stone Prices | Crushed Rock Costs & Advantages. Another crushed stone variety is the riprap stone, which measures 3 1/2 inches in diameter and serves well as a soil stabilizer, as a backing for stone walls and retaining wells Graded surge crushed stone that is 4 to 10 inches in diameter is an erosion controller like riprap and is also used in creek banks and large storm drain lin